Remove logics for old Python versions

Python 2.y and Python <= 3.2 are no longer supported, so we no longer
need to maintain logics for such old versions.

Also the check_python_version method is removed by this change, because
the required python version is now enforced by setup.cfg.

Change-Id: Ifc5e618a791bdf591e0ec61075089dd992c73e0c

tools/install_venv.py

@@ -39,11 +39,6 @@ def die(message, *args):
     sys.exit(1)
 
 
-def check_python_version():
-    if sys.version_info < (2, 7):
-        die("Need Python Version >= 2.7")
-
-
 def run_command(cmd, redirect_output=True, check_exit_code=True):
     """
     Runs a command in an out-of-process shell, returning the
@@ -137,7 +132,6 @@ def print_help():
 
 
 def main(argv):
-    check_python_version()
     check_dependencies()
     create_virtualenv()
     install_dependencies()

trove/common/stream_codecs.py

@@ -19,7 +19,6 @@ import configparser
 import csv
 import io
 import re
-import sys
 
 import xmltodict
 import yaml
@@ -229,11 +228,7 @@ class IniCodec(StreamCodec):
         return buf
 
     def _init_config_parser(self, sections=None):
-        # SafeConfigParser was deprecated in Python 3.2
-        if sys.version_info >= (3, 2):
         parser = configparser.ConfigParser(allow_no_value=True)
-        else:
-            parser = configparser.SafeConfigParser(allow_no_value=True)
         if sections:
             for section in sections:
                 parser.add_section(section)
@@ -452,10 +447,7 @@ class KeyValueCodec(StreamCodec):
         # Note(zhaochao): In Python 3, when files are opened in text mode,
         # newlines will be translated to '\n' by default, so we just split
         # the stream by '\n'.
-        if sys.version_info[0] >= 3:
         lines = stream.split('\n')
-        else:
-            lines = stream.split(self._line_terminator)
 
         result = {}
         for line in lines: